[#1115] shutdown command exit-value arg, exit w/failure on db loss

Added exit-value argument to shutdown command.
kea-dhcpX servers now exit with EXIT_FAILURE status on db loss

src/lib/process/daemon.*
    Daemon::exit_value_,  new member with getter/setter

src/lib/process/d_controller.*
    DControllerBase::launch() - now returns getExitValue()
    DControllerBase::shutdownHandler() - uses exit-value argument to set exit
    value

src/lib/process/tests/daemon_unittest.cc
    TEST_F(DaemonTest, exitValue)  - new test

src/bin/agent/main.cc
    Use launch() return value for exit value.

src/bin/agent/tests/ca_controller_unittests.cc
    TEST_F(CtrlAgentControllerTest, shutdownExitValue)  - new test

src/bin/d2/main.cc
    Use launch() return value for exit value.

src/bin/d2/tests/d2_command_unittest.cc
    TEST_F(CtrlChannelD2Test, shutdownExitValue)  - new test

src/bin/dhcp4/ctrl_dhcp4_srv.*
    ControlledDhcpv4Srv::
        commandShutdownHandler() - handle exit-value argument
        shutdown(int exit_value) - added exit_value parameter
        dbReconnect() - call shutdown(EXIT_FAILURE)
        dbLostCallback() - call shutdown(EXIT_FAILURE)

src/bin/dhcp4/dhcp4_srv.*
    Dhcp4Srv::run() - returns int Daemon::exit_value instead of bool

src/bin/dhcp4/main.cc
    Use run() return value for exit value.

src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc
    TEST_F(CtrlChannelDhcpv4SrvTest, commands) - revamped test

src/bin/dhcp6/ctrl_dhcp6_srv.*
    ControlledDhcpv6Srv::
        commandShutdownHandler() - use exit-value argument to set exit value
        shutdown(int exit_value) - added exit_value parameter
        dbReconnect() - call shutdown(EXIT_FAILURE)
        dbLostCallback() - call shutdown(EXIT_FAILURE)

src/bin/dhcp6/dhcp6_srv.*
    Dhcp6Srv::run() - returns int Daemon::exit_value instead of bool

src/bin/dhcp6/main.cc
    Use run() return value for exit value.

src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
    TEST_F(CtrlDhcpv6SrvTest, commands) - revamped test

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bin/dhcp4/main.cc b/src/bin/dhcp4/main.cc
index b8cd9a5205..9d72cebaab 100644
--- a/src/bin/dhcp4/main.cc
+++ b/src/bin/dhcp4/main.cc
@@ -269,7 +269,7 @@ main(int argc, char* argv[]) {
         LOG_INFO(dhcp4_logger, DHCP4_STARTED).arg(VERSION);
 
         // And run the main loop of the server.
-        server.run();
+        ret = server.run();
 
         LOG_INFO(dhcp4_logger, DHCP4_SHUTDOWN);